Isuzu engine 4j series. Manual - part 74

6C - 40  ENGINE FUEL

3. Power Steering Pump Drive Belt (P/S Model)

•

Install power steering pump drive belt and adjust belt
tension.

•

Depress the drive belt mid-portion with a 98N (10
kg/22 lb) force.

Drive Belt Deflection

mm (in)

                                                                                                                   

8 (0.31) - 10 (0.39)

                                                                                                                   

•

Tighten the idler lock nut to the specified torque.

N∙m (Kg∙m/lb ft)

                                                                                                                   

27 (2.8/20)

                                                                                                                   

2. Fan Shroud

•

Install the fan shroud and reservoir tank hose.

1. Cooling Fan Assembly

•

Mount fan pulley, distance piece, and cooling fan
assembly (in this order) on the water pump, and
tighten to the specified torque.

N∙m (Kg∙m/lb in)

                                                                                                                   

8 (0.8/69)

                                                                                                                   

•

Connect battery ground cable.

•

Pour coolant.

•

Start the engine and check coolant leakage.

6C-39-1.tif

ENGINE FUEL  6C - 41

INJECTION TIMING ADJUSTMENT

•

Set No. 1 cylinder to top dead center.

•

Remove injection pump distributor head plug.

•

Cancel wax CSD with the handle of a screw driver.

•

Fit a dial gauge and set lift to 2 mm.

Measuring device: 5-8840-0145-0

•

Set crankshaft damper pulley top dead center mark
about 45° before top dead center from the pointer.

•

Set dial gauge in the "0" position.

•

Turn the crankshaft a little right wise and left wise and
see if the pointer is stable in the "0" position.

•

Turn the crankshaft in the normal direction and read
the measuring device's indication at as follows.

4JB1

BTDC 14°, BTDC 12° (’91/
542A)

4JB1T

BTDC11°

4JB1TC

BTDC4°

4JG2 (Belt Drive Type) ATDC 1° (’91/ 542A)

TDC 0° (’91/ 542B)

   "   (Gear Drive Type) ATDC 2° (’91/ 542A)

Measuring Device's Indication

mm (in)

Standard

0.5 (0.0197)

•

If it reads abnormal, loosen injection pump fixing nut
and pump bracket adjust bolt, make adjustment by
changing the pump mounting angle, and tighten the
nut and bolt to the specified torque where the dial
indicates the specified valve.

Pump fixing nut

N∙m (Kg∙m/lb∙ft)

                                                                                                                   

24 (2.4/17)

                                                                                                                   

Adjust bolt

N∙m (Kg∙m/lb∙ft)

                                                                                                                   

19 (1.9/14)

                                                                                                                   

•

Remove the measuring device and tighten the
distributor head plug to the specified torque.

N∙m (Kg∙m/lb∙ft)

                                                                                                                   

17 (1.7/12)

                                                                                                                   

CAUTION

•

When installing the distributor head plug, be sure to
use new copper washer.

•

Connect injection pipe.

•

Fit pipe clip where specified.

6C-40-3.tif

6C-40-4.tif

6C-40-1.tif

6C-40-2.tif

6C - 42  ENGINE FUEL

Adjustment of Idling Speed

1) Pull the parking brake and lock the wheels.
2) Set the transmission gear to the neutral position.
3) Start the engine and idle it until the water temperature

gets to 70 to 80°C (158 to176°F).

4) Turn back the idling control button, and remove the

control cable from the control lever (injection pump)

5) Set the engine tachometer.
6) Check the idling rotation.

When the idling rotation is outside the range of the
specified value, adjust it correctly.

Specified value (rpm) = 750 - 790 (4JB1)

700 - 740 (4JG2)

(1) Loosen the lock nut of the idling set bolt.
(2) Rotate the idling set bolt to set the idling rotation to the

specified value.

(3) Tighten the lock knut to lock the set bolt.
(4) Check the tension of the control cable, and remove

any slackening as required.

6C-41-1.tif

6C-41-2.tif

ENGINE FUEL  6C - 43

INJECTION PUMP DATA

TEST CONDITIONS

Items

Conditions

Engine Type

4JB1(Gear)

4JG2(Belt)

(For '91/542B)

4JB1(Gear)

(For '91/542A)

4JG2(Gear)

(For '91/542A)

4JB1TC

4JB1T

Euro 2

Euro 1

Euro 1

Injection Nozzle

ZEXEL Part Number

105780-0000

105780-0000

105780-0060

105780-0060

105780-0060

Bosch Type Number

DN12SD12T

DN12SD12

DN00SD1510



Injection Nozzle holder

ZEXEL Part Number

105780-2080

105780-2080

105780-2150

105780-2150

105780-2150

Bosch Type Number

EF8511/9

EF8511/9







Injection Nozzle

MPa(kg/cm

2

/psi)

14.7 (150 / 2,133)

13.0(133 / 1,891)

Opening Pressure

Injection Line dimensions

mm(in)

Inside Diameter

2 (0.079)

Outside Diameter

6 (0.236)

Length

840 (33.1)

450 (17.7)

Fuel delivery Pressure kPa(kg/cm2/psi)

20 (0.2 / 2.84)

Test Fuel

SAE Standard Test Diesel Fuel (SAE967D)

ISO Standard Test Diesel Fuel (ISO4113)

Test Fuel Temperature

°C (°F)

48 - 52 (118-126)

Identification Numbers

104746-1230

196000-1042

104742-1451

104746-1222

104746-6601

104746-6311

104746-1240

104742-1461

104746-1250

104742-1471

104746-1211

104766-6620

104746-6380

104746-1260

104742-1480

4JG2 (Belt)

104746-6670

104746-1270

104742-1490

(For +91/542A)

104746-1280

104746-1290

104746-1370

Note:

'91/542A ; Euro 1
'91/542B ; Euro 2